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Effects of freeze-thaw and wet-dry cycles on the formation of soil macropores and preferential flow under simulative conditions in the laboratory, and preferential migration of linear alkylbenzene sulfonate (LAS) in paddy and soybean soils in field lysimeters were studied. Results showed that both freeze-thaw and wet-dry cycles could cause macropores and preferential flow in soils and that the former...
Experimental measurements of the adsorption of linear alkylbenzene sulfonate (LAS) on soils were made at 25°C using a continuous adsorption apparatus. The adsorption of LAS on natural soils could be divided into two stages: linear and exponentially increasing isotherms. At low LAS conctration (<90 μg ml -1 ), the adsorption isotherms were linear and Kd was among 1.2 to 2.0. At high...
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